Well that looks more like just a harmless friendly little event (Thank Gosh!) like Punisher: Warzone or Avengers: X-sanction, whereas AoU will be shipping $5 comics every week! (I think) and span like 12-somethin' issues.

Trinity War is DC's event they've been building up ever since Pandora showed up in Flashpoint #5 (She was in the timeline-merging sequence). It was teased in last years FCBD New 52 #1. It looks like it will be the New 52 JLA vs. the Justice League in a "war". I think you can get the FCBD issue at the DC website.

@Jagedar: Nice avatar! Yeah, I'm interested in seeing how things are going to go with Trinity War as Phantom Stranger #4 had some interaction between the PS and Pandora and the Spectre, a favorite character of mine, was alluded to. Haven't read/don't know if issue 5 is out but I'm psyched to see what happens. Nevermind. What I just talked about doesn't seem to tie in to what you said. Carry on, gents.

I figured the "trinity" referred to the trinity of sin as shown in the FCBD issue. Who knows? It's likely trinity has multiple meanings in the event. On an unrelated note, did anyone else know Geoff Johns (whose writing Trinity War) left Green Lantern!?